Research On Fused Deposition Additive Manufacturing Of Polyetheretherketone Ternary Composites

Fused deposition modeling technology(FDM)has the advantages of high modeling efficiency and easy operation,and has received widespread attention in the field of parts manufacturing,and has become the most widely used 3D printing technology.With the increasing competition of industrial products,high-performance printing consumables are one of the main bottlenecks hindering the further development of FDM technology.Polyetheretherketone(PEEK),which has higher strength and low density,is gradually replacing the application of materials such as metals and ceramics in areas with higher lightweight requirements,but its wear resistance is poor.Therefore,how to improve the wear resistance of PEEK is an urgent problem to be solved to promote the application of PEEK parts FDM in remanufacturing.In this paper,PEEK/polytetrafluoroethylene(PTFE)/carbon fiber(CF)composites were prepared based on FDM printing technology,and the influence of PTFE and CF on the abrasion resistance strengthening effect and other properties of PEEK composites was studied.First of all,starting from the FDM process parameters,the influence of FDM process parameters on the modeling quality and performance of the material is discussed,and the optimized process parameters are obtained.Subsequently,according to the wear resistance characteristics of PEEK,the wear resistance and mechanical properties of PTFE/PEEK binary composites were studied.Finally,the relationship between CF content and tensile properties and wear resistance of PTFE/PEEK binary composites is discussed,and the FDM manufacturing process of high-strength wear-resistant complex structural parts is studied on the basis of optimizing the process parameters.The main research content of this article is as follows:The twin screw extrusion mechanism is prepared with composite wire materials with different PTFE/PEEK ratios to determine the appropriate extrusion process parameters,and the thermal properties of PTFE/PEEK composite materials are studied by differential scanning calorimetry(DSC),the melting temperature,crystallization temperature and crystallinity of the composite materials are analyzed,and the influence mechanism of printing temperature parameters on the tensile properties of composite materials is clarified,which provides a reference for subsequent experiments to determine the printing parameters of samples.Applications with high wear resistance requirements require pure PEEK to have a certain strength and wear resistance.Therefore,the influence of PTFE content,friction speed and friction load on the friction coefficient and wear amount of composite materials was studied experimentally,the contact angle of the surface of PTFE/PEEK binary composites and their tensile strength were explored,and the influence mechanism of PTFE on the wettability and fracture mechanism of PTFE/PEEK composites was clarified.PTFE strengthens PEEK abrasion resistance at the expense of strength.To this end,with the goal of both strength and wear resistance,the system analyzes the mechanical properties,friction and wear properties,thermal conductivity and hardness of CF/PTFE/PEEK ternary composite material 3D printing wire,and analyzes the reasons for the improvement of wear resistance of ternary composite materials from the perspective of thermal conductivity and hardness,based on the optimized extrusion process and high-strength wear-resistant CF/PTFE/PEEK composite materials,the feasibility of FDM 3D printing technology with high performance,multi-purpose complex and high-strength wear-resistant structural parts is studied.